They are also able to discriminate between familiar individuals, and among humans. Cattle can tell the difference between familiar and unfamiliar animals of the same species (conspecifics). Studies show they behave less aggressively toward familiar individuals when they are forming a new group.  Calves can also discriminate between humans based on previous experience, as shown by approaching those who handled them positively and avoiding those who handled them aversively.  Although cattle can discriminate between humans by their faces alone, they also use other cues such as the color of clothes when these are available. 
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The Canadian Animal Health Institute reports that steroid hormones have a long safety record without incident for cattle and consumers dating back to their introduction in Canada in the 1960s and 1950s in the . They are also approved for use in Mexico, Australia, New Zealand, South Africa, Japan, Chile and another 24 countries. The World Health Organization, United Nations Food and Agriculture Organization, the European Community Scientific Committee and the Joint Expert Committee on Food Additives agree that hormones used in beef cattle production don’t pose a health risk to humans.